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Carbon stable isotopes reveal complex trophic interactions in lake plankton.

Grey, Jonathan and Jones, Roger I. (1999) Carbon stable isotopes reveal complex trophic interactions in lake plankton. Rapid Communications in Mass Spectrometry, 13 (13). pp. 1311-1314. ISSN 0951-4198

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Abstract

The lower trophic linkages in lake plankton food webs are generally described as relatively simple, even accounting for the additional complexity of potential microbial looping. Crustacean zooplankton are frequently amalgamated into one trophic functional group as grazers of autotrophic production. The carbon stable isotope ratios for separated zooplankton species, particulate organic matter (POM) and phytoplankton from a number of lakes in Finland and the UK were analysed. These revealed greater complexity in trophic interactions than would otherwise be observed if the zooplankton had been represented by a mixed sample. Grazing zooplankton were usually depleted in 13C relative to the bulk POM on which they might feed, with 13C deviating by up to 17 There were no consistent differences between 13C values for copepods and cladocerans. Predatory cladocerans were generally enriched by greater than 1 compared to their putative prey. We suggest that care in separating the zooplankton species for stable isotope analysis may expose otherwise undetected sources of carbon and facilitate unravelling trophic links further up the food web.

Item Type: Article
Journal or Publication Title: Rapid Communications in Mass Spectrometry
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > School of Computing & Communications
ID Code: 10939
Deposited By: Mr Richard Ingham
Deposited On: 28 Jul 2008 13:12
Refereed?: Yes
Published?: Published
Last Modified: 18 Sep 2013 16:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10939

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